JP3834381B2

JP3834381B2 - Ceiling inspection port bearing

Info

Publication number: JP3834381B2
Application number: JP14867997A
Authority: JP
Inventors: 良雄柳原
Original assignee: 株式会社サヌキ
Priority date: 1997-05-21
Filing date: 1997-05-21
Publication date: 2006-10-18
Anticipated expiration: 2017-05-21
Also published as: JPH10317660A

Description

【０００１】
【発明の属する技術分野】
この発明は、建物の天井内部に配備される配管、配線等の設備の点検、修理をするために配備される天井点検口の軸受け体に関する。
【０００２】
【従来の技術】
図８は、従来の天井点検口の軸受け体を示す斜視図である。
この天井点検口の軸受け体７は、樹脂製平板７１で、底面が外枠２の内側フランジ面２１に接面状に取付けられる。平板７１の外面には、取付け用突部７２が突設され、外枠２の垂直壁２２に設けた窓孔２３に対し押し込み固定する。
この軸受け体（平板７１）７の前端面には、高さ中央部にヒンジ軸８を挿入する開口部７３を開設し、且つこの開口部７３に連続する下り傾斜溝部７４を設け、この下り傾斜溝部７４の底部をヒンジ軸嵌合部７５としている。
【０００３】
図９で示すように、内枠の外面に突出状に取付けられるヒンジ軸部８は、外枠２の内側フランジ面２１上を後端側へ移動させる。そして、軸受け体７の前端面に近づいたヒンジ軸部８’が前端面に当たった後、内枠を上方へ持ち上げ、ヒンジ軸部８’と前端面の開口７３とを位置合わせし、開口７３に挿入することで、ヒンジ軸部８’が下り傾斜溝部７４内を下降し、溝底の嵌合部７５に嵌着する。これにより、内枠が外枠２に対し回動可能に取付けられる。
【０００４】
【発明が解決しようとする課題】
従来の天井点検口の軸受け体は、前端面の高さ中央部に開口７３が開設してある。従って、開口７３の高さ位置はヒンジ軸部８が摺動して来る外枠の内側フランジ面（軸受け体７の底面）２１より相当程度高い位置にある。このため、開口７３に対し、ヒンジ軸部８を挿入する際は、内枠を持ち上げる作業が必要となる。ところが、この持ち上げ高さが、どの程度であるかは、内枠（扉面）と外枠との隙間が僅かであるために、下方からは外観できない。このため、開口７３に対しヒンジ軸部８の高さ位置合わせ及び挿入が困難である。
【０００５】
また、軸受け体７の前端面に開設される開口７３の上下面は、面一状態となっており、内枠を持ち上げた際、ヒンジ軸部の上昇を阻止する部材がない。従って、ヒンジ軸部８が開口７３を通り越し（図９のピン軸８”参照）、何度も同じ位置合わせ作業を繰り返す等の不利があった。
更に、外枠に対し内枠を取り外す際には、開口７３に連続する溝部７４が急な下り傾斜となっているため、溝底の嵌合部７５からヒンジ軸部８を取り出す作業に手間どる等の不利があった。
【０００６】
この発明は、以上のような課題を解消させ、ヒンジ軸部と溝開口部との位置合わせが全く不要であり、外枠の内側フランジ面上に位置するヒンジ軸部を単に移動させるだけで、自動的に嵌合部に嵌着させることができ、嵌脱が容易で作業性の良好な天井点検口の軸受け体を提供することを目的とする。
【０００７】
【課題を解決するための手段】
この目的を達成させるために、この発明の天井点検口の軸受け体は、次のような構成としている。
天井点検口の軸受け体は、ヒンジ軸部を備えた内枠と、このヒンジ軸部を嵌合する軸受け体を備えた外枠とから成り、外枠に対し内枠を回動可能に配備する天井点検口であって、前記軸受け体は底面が外枠の内側フランジ面に取付けられる平板で、この平板の面内下部に設けられ、先端面が内側フランジ面と面一状で、後端部方向へ膨出状に弯曲するガイド溝底部と、このガイド溝底部の後端部に連続し、ガイド溝底部の弯曲頂部より降下して位置する嵌合部と、前記ガイド溝底部に対し所定間隔開いた上壁に連続し、ガイド溝底部の開口先端より前方へ突出する突出部に設けられ、ヒンジ軸部の上方への移動を阻止するストッパ部とから成ることを特徴としている。
【０００８】
このような構成を有する天井点検口の軸受け体では、内枠外面から突出するヒンジ軸部を、外枠の内側フランジ面部の上面に載せ、この状態でヒンジ軸部を移動（摺動）させる。ヒンジ軸部が、軸受け体に近づくと、仮に移動中においてヒンジ軸部が内側フランジ面上より僅かに浮上することがあっても、先端突出部のストッパ部に突き当たる。ストッパ部の下面は後端部方向（ガイド溝の先端開口部方向）へ向けて膨出する弯曲状に設定してある。従って、ヒンジ軸部はストッパ部に衝突することで、それ以上の上方への移動が阻止される。更に、ストッパ部の下面膨出弯曲面によってガイド溝部の先端開口部に導かれる。
【０００９】
ガイド溝部の開口先端部は、内側フランジ面と面一状となっており段差が全くない。従って、更にヒンジ軸部を押し進めると、ヒンジ軸部はガイド溝底部の弯曲面を頂部方向へスムーズに進み、自動的に溝部に連通する嵌合部に嵌着する。従って、外枠の内側フランジ面部の上面に載せ置いたヒンジ軸部を単に押し進めるだけで、自動的に嵌合部に嵌着させ得る。
【００１０】
【発明の実施の形態】
以下、図面に基づき本発明に係る天井点検口の軸受け体の具体的な実施の形態を説明する。
【００１１】
図６及び図７で示すように、天井点検口は外枠２と内枠３と、内枠３の枠内を塞ぐ蓋板５とから構成される。
図２は、天井点検口の内枠３とヒンジ軸部４との関係を示す斜視図である。
内枠３は、外枠２に対し後述するヒンジ軸部４と軸受け体１を介して、外枠２の枠開口に回転可能に取付けられる。内枠３には、内枠３の枠開口を塞ぐ蓋板５が取付けられ、点検口の扉が構成される。
【００１２】
内枠３は、例えば、鋼材、アルミ合金材等を所定長さの枠片に切断されたものを方形状に突き合わせて枠組みし、コーナー金具Ａを使用して組組み固定される。内枠３の外側の上・下フランジ面３１、３１には、対向状に上・下溝部３１ａ、３１ａを設けている。内枠３の４隅に配備される各コーナー金具Ａは、この上・下溝部３１ａ、３１ａに、上辺部及び下辺部がスライド嵌着する。そして、内枠３の４隅のうちの後端部側に配備される左右両側の２つのコーナー金具Ａの外面には、それぞれピン軸（ヒンジ軸部）４が外方向へ突設してある。つまり、コーナー金具Ａがヒンジを兼用している。
【００１３】
図１は、天井点検口の外枠２と軸受け体１の関係を示す斜視図である。
外枠２は、内枠３と同様の資材で形成され、方形に突き合わされた枠片がコーナ金具Ａで枠組み固定されている。
【００１４】
外枠２の後端部、つまり垂直壁部２２の後端部に、軸受け体１が取付けられる。垂直壁部２２には、取付け用窓孔２２ａが開設してある。また、垂直壁部２２の下端部には水平状の内向きフランジ面部２１が突設してある。一方、軸受け体１の外面には、突軸部１１ａが突設してある。軸受け体１の底面を、内側フランジ面部２１の上面に載せ置いた状態で、突軸部１１ａを取付け用窓孔２２に押し込み固定することで、外枠２の垂直壁部２２の後端部に軸受け体１が取付けられる。
【００１５】
軸受け体１は、例えば合成樹脂材により成型された一定厚みを有する平板である。この平板１１は、前記外枠２の垂直壁部２２の高さと略等しい高さを有し、且つ内側フランジ面部２１の突出幅と略等しい厚みを有する。
この軸受け体（平板１１）１の面内下部には、前端側から後端方向へ一定長さ切欠いてガイド溝を形成する。ガイド溝は、ガイド溝底部１２と、嵌合部１３と、ストッパ部１４ｂとから成る。
具体的には、平板１１の面内下部には、先端面１２ｂが内側フランジ面２１と面一状で、且つ後端部方向へ膨出状に弯曲するガイド溝底部１２を設け、このガイド溝底部１２の後端部に連続し、ガイド溝底部１２の弯曲頂部１２ａより降下して位置する嵌合部１３を連続形成している。
【００１６】
更に、前記ガイド溝底部１２に対し所定間隔開いた上壁１４には、上壁１４に連続し、ガイド溝底部１２の先端開口１２ｂより前方へ突出する突出部１４ａを設け、この突出部１４ａにヒンジ軸部４の上方への移動を阻止するストッパ部１４ｂを形成している。
【００１７】
ストッパ部１４ｂは、上記ガイド溝部１２の先端開口面（内側フランジ面２１と先端面が高さ面一である開口面）より、前方へ突出する庇状に形成されるもので、その下面は後端部方向（ガイド溝部１２の先端開口部１２ｂ方向）へ向けて膨出する弯曲状に設定した膨出弯曲面部１４ｃに形成してある。
【００１８】
このような構成を有する天井点検口の軸受け体では、図４に示すように、外枠２の内側フランジ面部２１の上面に、内枠３のヒンジ軸部４を載せ置く。この状態で、内枠３を外枠２の後端部方向へ移動させる。
【００１９】
外枠２の内側フランジ面上２１を、内枠３外面から突出するヒンジ軸部４を摺動（移動）させ、ヒンジ軸部４が軸受け体１に近づくと、仮に移動中のヒンジ軸部４が内側フランジ面部２１の上面より僅かに浮上することがあっても、先端突出部１４ａのストッパ部１４ｂに突き当たる。
【００２０】
ストッパ部１４ｂの下面は、ガイド溝部１２の先端開口部１２ｂ方向へ向けて膨出する弯曲部１４ｃに設定してある。従って、ヒンジ軸部４はストッパ部１４ｂの下面に衝突することで、それ以上の上方への移動が阻止されると共に、ストッパ部１４ｂの下面膨出弯曲面１４ｃに沿ってガイド溝部１２の先端開口部１２ｂに導かれる。つまり、図３で示すように、ガイド溝部の開口先端１２ｂは、ストッパ面部１４ｂの下面膨出弯曲面１４ｃの後端よりさらに後退した位置に設定してある。従って、ヒンジ軸部４は下面膨出弯曲面１４ｃと内側フランジ面２１との間の空間に容易に導かれる（図３参照）。
【００２１】
更に、ガイド溝部１２の開口１２ｂの先端は、内側フランジ面部２１の上面と高さが面一状に設定され、段差が全くない。従って、更にその状態のまま、ヒンジ軸部４を押し進めると、ヒンジ軸部４は抵抗なくスムーズに弯曲状に膨出するガイド溝底部１２上へ進み、且つガイド溝底部１２の弯曲頂部１２ａ方向へ進み、頂部１２ａを越えて自動的に溝部に連通する嵌合部１３内に嵌着する（図５参照）。
【００２２】
従って、ガイド溝部１２の先端開口面１２ｂと内側フランジ面２１とが、高さ面一状となっており、段差がなく滑らかな弯曲状に設定してあるから、溝先端開口１２ｂとヒンジ軸部４との位置合わせが不要であり、外枠２の内側フランジ面部２１上面に載置するヒンジ軸部４を単に押し進めるだけで、自動的に嵌合部１３内へ落とし込まれる。更に、嵌合部１３と弯曲頂部１２ａとの段差も少ないから、嵌合部１３内のヒンジ軸部４を僅かに持ち上げるだけで、嵌合部１３との係合を容易に取り外すことが出来る。
【００２３】
【発明の効果】
この発明では、以上のように、前端部上方にストッパ部を設け、このストッパ部より後退した位置に、ガイド溝部の開口先端を設け、且つガイド溝底部は後方の嵌合部に向けて膨出状に弯曲させると共に、開口先端面を内側フランジ面部と面一高さに設定することとしたから、ヒンジ軸部を内側フランジ面部の上面に載せ置き、単に内側フランジ上面をスライド移動させるだけで、自動的にガイド溝底部を経て嵌合部に嵌着させ得る。従って、従来のようにヒンジ軸部を持ち上げ、軸受け体の開口部と位置合わせする等の不利がない許かりでなく、作業性が良く取付け取外しが簡便である等、発明目的を達成した優れた効果を有する。
【図面の簡単な説明】
【図１】外枠と軸受け体との関係を示す斜視図である。
【図２】内枠とヒンジ軸部との関係を示す斜視図である。
【図３】ヒンジ軸部が内側フランジ面上を移動し軸受け体に嵌入する状態を示す説明図である。
【図４】内枠を外枠に取付ける状態を示す説明図である。
【図５】内枠を外枠にヒンジを介して取付けた状態を示す説明図である。
【図６】天井点検口を示す斜視図である。
【図７】天井点検口の蓋板扉を閉じた状態を示す平面図である。
【図８】従来の外枠と軸受け体の関係を示す斜視図である。
【図９】従来のヒンジ軸と軸受け体との関係を示す作用説明図である。
【符号の説明】
１軸受け体
２外枠
３内枠
４ヒンジ軸部
１１平板
１２ガイド溝底部
１３嵌合部
１４上壁部
２１内側フランジ面
１２ａ弯曲頂部
１２ｂ先端開口
１４ａ突出部
１４ｂストッパ部
１４ｃ膨出弯曲面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing body for a ceiling inspection port provided to inspect and repair equipment such as piping and wiring provided in a ceiling of a building.
[0002]
[Prior art]
FIG. 8 is a perspective view showing a bearing body of a conventional ceiling inspection port.
The bearing body 7 of the ceiling inspection port is a resin flat plate 71, and the bottom surface is attached to the inner flange surface 21 of the outer frame 2 in a contact surface shape. A mounting projection 72 projects from the outer surface of the flat plate 71 and is fixed by being pushed into the window hole 23 provided in the vertical wall 22 of the outer frame 2.
An opening 73 for inserting the hinge shaft 8 is opened at the center of the height on the front end surface of the bearing body (flat plate 71) 7 and a downward inclined groove 74 is provided continuously to the opening 73. The bottom of the groove 74 is a hinge shaft fitting portion 75.
[0003]
As shown in FIG. 9, the hinge shaft portion 8 attached in a protruding manner to the outer surface of the inner frame moves on the inner flange surface 21 of the outer frame 2 to the rear end side. Then, after the hinge shaft portion 8 ′ approaching the front end surface of the bearing body 7 hits the front end surface, the inner frame is lifted upward, and the hinge shaft portion 8 ′ and the opening 73 on the front end surface are aligned, thereby opening 73. As a result, the hinge shaft portion 8 ′ descends in the downward inclined groove portion 74 and is fitted into the fitting portion 75 at the groove bottom. Accordingly, the inner frame is attached to the outer frame 2 so as to be rotatable.
[0004]
[Problems to be solved by the invention]
A conventional bearing body for a ceiling inspection port has an opening 73 at the center of the height of the front end face. Therefore, the height position of the opening 73 is substantially higher than the inner flange surface (the bottom surface of the bearing body 7) 21 of the outer frame on which the hinge shaft portion 8 slides. For this reason, when inserting the hinge shaft portion 8 into the opening 73, an operation of lifting the inner frame is required. However, the extent of the lifting height cannot be seen from below because the gap between the inner frame (door surface) and the outer frame is very small. For this reason, it is difficult to align and insert the height of the hinge shaft portion 8 with respect to the opening 73.
[0005]
Further, the upper and lower surfaces of the opening 73 opened on the front end surface of the bearing body 7 are flush with each other, and there is no member that prevents the hinge shaft portion from rising when the inner frame is lifted. Therefore, there is a disadvantage that the hinge shaft portion 8 passes through the opening 73 (see the pin shaft 8 ″ in FIG. 9), and the same alignment operation is repeated many times.
Further, when the inner frame is removed from the outer frame, the groove portion 74 continuing to the opening 73 has a steep downward slope, so that it takes time to take out the hinge shaft portion 8 from the fitting portion 75 at the groove bottom. There were disadvantages such as.
[0006]
The present invention eliminates the above-described problems, does not require any alignment between the hinge shaft and the groove opening, and simply moves the hinge shaft located on the inner flange surface of the outer frame. An object of the present invention is to provide a bearing body for a ceiling inspection port that can be automatically fitted to a fitting portion, can be easily fitted and detached, and has good workability.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the bearing body of the ceiling inspection port of the present invention has the following configuration.
The bearing body of the ceiling inspection port is composed of an inner frame having a hinge shaft portion and an outer frame having a bearing body to which the hinge shaft portion is fitted, and the inner frame is rotatably arranged with respect to the outer frame. A ceiling inspection port, wherein the bearing body is a flat plate whose bottom surface is attached to the inner flange surface of the outer frame, and is provided at a lower portion in the surface of the flat plate, the front end surface is flush with the inner flange surface, and the rear end portion A guide groove bottom portion that bulges in a direction, a fitting portion that is continuous with the rear end portion of the guide groove bottom portion and is lowered from the bent top portion of the guide groove bottom portion, and a predetermined distance from the guide groove bottom portion It is characterized by comprising a stopper portion that is continuous with the open upper wall, is provided on a protruding portion that protrudes forward from the opening tip of the guide groove bottom, and prevents the hinge shaft portion from moving upward.
[0008]
In the bearing body of the ceiling inspection port having such a configuration, the hinge shaft portion protruding from the outer surface of the inner frame is placed on the upper surface of the inner flange surface portion of the outer frame, and the hinge shaft portion is moved (slid) in this state. When the hinge shaft portion approaches the bearing body, even if the hinge shaft portion is slightly lifted from the inner flange surface during movement, it hits the stopper portion of the tip protruding portion. The lower surface of the stopper portion is set in a curved shape that bulges toward the rear end direction (direction of the front end opening of the guide groove). Accordingly, the hinge shaft portion collides with the stopper portion, and further upward movement is prevented. Further, it is guided to the tip opening of the guide groove by the lower surface bulging curved surface of the stopper.
[0009]
The opening tip of the guide groove is flush with the inner flange surface and has no step. Therefore, when the hinge shaft portion is further pushed forward, the hinge shaft portion smoothly advances along the curved surface at the bottom of the guide groove toward the top, and automatically fits into the fitting portion communicating with the groove portion. Accordingly, the hinge shaft portion placed on the upper surface of the inner flange surface portion of the outer frame can be automatically fitted to the fitting portion simply by pushing forward.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of a bearing body for a ceiling inspection port according to the present invention will be described with reference to the drawings.
[0011]
As shown in FIGS. 6 and 7, the ceiling inspection port includes an outer frame 2, an inner frame 3, and a cover plate 5 that closes the inside of the inner frame 3.
FIG. 2 is a perspective view showing the relationship between the inner frame 3 of the ceiling inspection port and the hinge shaft portion 4.
The inner frame 3 is rotatably attached to the frame opening of the outer frame 2 via a hinge shaft portion 4 and a bearing body 1 described later with respect to the outer frame 2. A cover plate 5 that closes the frame opening of the inner frame 3 is attached to the inner frame 3 to constitute a door for an inspection port.
[0012]
The inner frame 3 is assembled and fixed by using a corner metal fitting A, for example, in which a steel material, an aluminum alloy material or the like cut into frame pieces of a predetermined length is abutted into a rectangular shape. Upper and lower groove portions 31 a and 31 a are provided on the upper and lower flange surfaces 31 and 31 on the outer side of the inner frame 3 so as to face each other. The corner metal fittings A provided at the four corners of the inner frame 3 have the upper and lower sides slidably fitted into the upper and lower groove portions 31a and 31a. Then, pin shafts (hinge shaft portions) 4 project outwardly from the outer surfaces of the two left and right corner metal fittings A arranged on the rear end side of the four corners of the inner frame 3. . That is, the corner metal fitting A also serves as a hinge.
[0013]
FIG. 1 is a perspective view showing the relationship between the outer frame 2 of the ceiling inspection port and the bearing body 1.
The outer frame 2 is formed of the same material as that of the inner frame 3, and a frame piece abutted on a square is fixed to the frame by a corner metal fitting A.
[0014]
The bearing body 1 is attached to the rear end portion of the outer frame 2, that is, the rear end portion of the vertical wall portion 22. An attachment window hole 22 a is formed in the vertical wall portion 22. Further, a horizontal inward flange surface portion 21 projects from the lower end portion of the vertical wall portion 22. On the other hand, a projecting shaft portion 11 a is projected from the outer surface of the bearing body 1. With the bottom surface of the bearing body 1 placed on the top surface of the inner flange surface portion 21, the projecting shaft portion 11 a is pushed into the mounting window hole 22 and fixed to the rear end portion of the vertical wall portion 22 of the outer frame 2. A bearing body 1 is attached.
[0015]
The bearing body 1 is a flat plate having a certain thickness and formed by a synthetic resin material, for example. The flat plate 11 has a height substantially equal to the height of the vertical wall portion 22 of the outer frame 2 and a thickness substantially equal to the protruding width of the inner flange surface portion 21.
A guide groove is formed in the in-plane lower portion of the bearing body (flat plate 11) by cutting out a predetermined length from the front end side to the rear end direction. The guide groove includes a guide groove bottom portion 12, a fitting portion 13, and a stopper portion 14b.
Specifically, a guide groove bottom portion 12 having a front end surface 12b that is flush with the inner flange surface 21 and that bulges toward the rear end portion is provided at the lower part of the flat surface of the flat plate 11, and this guide groove A fitting portion 13 that is continuous with the rear end portion of the bottom portion 12 and is positioned lower than the bent top portion 12a of the guide groove bottom portion 12 is continuously formed.
[0016]
Further, the upper wall 14 that is open at a predetermined interval with respect to the guide groove bottom 12 is provided with a protrusion 14a that is continuous with the upper wall 14 and protrudes forward from the tip opening 12b of the guide groove bottom 12. A stopper portion 14b that prevents the hinge shaft portion 4 from moving upward is formed.
[0017]
The stopper portion 14b is formed in a bowl shape protruding forward from the front end opening surface of the guide groove portion 12 (opening surface where the front end surface is flush with the inner flange surface 21). It is formed in the bulging wrinkle curved surface part 14c set to the curve shape which bulges toward the edge part direction (direction of the front-end opening part 12b of the guide groove part 12).
[0018]
In the bearing body of the ceiling inspection port having such a configuration, as shown in FIG. 4, the hinge shaft portion 4 of the inner frame 3 is placed on the upper surface of the inner flange surface portion 21 of the outer frame 2. In this state, the inner frame 3 is moved toward the rear end portion of the outer frame 2.
[0019]
When the hinge shaft portion 4 protruding from the outer surface of the inner frame 3 is slid (moved) on the inner flange surface 21 of the outer frame 2 and the hinge shaft portion 4 approaches the bearing body 1, the moving hinge shaft portion 4 is temporarily moved. Even if it slightly floats from the upper surface of the inner flange surface portion 21, it hits against the stopper portion 14b of the tip protruding portion 14a.
[0020]
The lower surface of the stopper portion 14b is set to a curved portion 14c that bulges toward the tip opening portion 12b of the guide groove portion 12. Accordingly, the hinge shaft portion 4 collides with the lower surface of the stopper portion 14b, thereby preventing further upward movement, and opening of the guide groove portion 12 along the lower surface bulging curved surface 14c of the stopper portion 14b. Guided to section 12b. That is, as shown in FIG. 3, the opening tip 12b of the guide groove portion is set at a position further retracted from the rear end of the lower surface bulging curved surface 14c of the stopper surface portion 14b. Therefore, the hinge shaft portion 4 is easily guided to the space between the lower surface bulging curved surface 14c and the inner flange surface 21 (see FIG. 3).
[0021]
Furthermore, the tip of the opening 12b of the guide groove portion 12 is set to be flush with the upper surface of the inner flange surface portion 21, and there is no step. Therefore, when the hinge shaft portion 4 is further pushed in that state, the hinge shaft portion 4 proceeds on the guide groove bottom portion 12 that bulges smoothly and without resistance, and toward the curved top portion 12a of the guide groove bottom portion 12. It advances and fits in the fitting part 13 which automatically communicates with the groove part beyond the top part 12a (see FIG. 5).
[0022]
Accordingly, the front end opening surface 12b and the inner flange surface 21 of the guide groove portion 12 have the same height, and are set to have a smooth curve without a step, so that the groove front end opening 12b and the hinge shaft portion are formed. 4 is not necessary, and the hinge shaft portion 4 placed on the upper surface of the inner flange surface portion 21 of the outer frame 2 is simply pushed forward and is automatically dropped into the fitting portion 13. Further, since there are few steps between the fitting portion 13 and the bent top portion 12a, the engagement with the fitting portion 13 can be easily removed by slightly lifting the hinge shaft portion 4 in the fitting portion 13.
[0023]
【The invention's effect】
In the present invention, as described above, the stopper portion is provided above the front end portion, the opening tip of the guide groove portion is provided at a position retracted from the stopper portion, and the guide groove bottom portion bulges toward the rear fitting portion. And the opening tip surface is set to be flush with the inner flange surface portion, so that the hinge shaft portion is placed on the upper surface of the inner flange surface portion, and the inner flange upper surface is simply slid and moved. It can be automatically fitted to the fitting portion via the guide groove bottom. Therefore, it is not a permissible disadvantage such as lifting the hinge shaft part and aligning with the opening of the bearing body as in the conventional case, and it is excellent in achieving the object of the invention, such as good workability and easy attachment / detachment. Has an effect.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a relationship between an outer frame and a bearing body.
FIG. 2 is a perspective view showing a relationship between an inner frame and a hinge shaft portion.
FIG. 3 is an explanatory view showing a state in which the hinge shaft portion moves on the inner flange surface and is fitted into the bearing body.
FIG. 4 is an explanatory view showing a state in which the inner frame is attached to the outer frame.
FIG. 5 is an explanatory view showing a state in which the inner frame is attached to the outer frame via a hinge.
FIG. 6 is a perspective view showing a ceiling inspection port.
FIG. 7 is a plan view showing a state in which the lid plate door of the ceiling inspection port is closed.
FIG. 8 is a perspective view showing a relationship between a conventional outer frame and a bearing body.
FIG. 9 is an operation explanatory view showing a relationship between a conventional hinge shaft and a bearing body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bearing body 2 Outer frame 3 Inner frame 4 Hinge shaft part 11 Flat plate 12 Guide groove bottom part 13 Fitting part 14 Upper wall part 21 Inner flange surface 12a Curved top part 12b Tip opening 14a Projection part 14b Stopper part 14c Swelling curved surface

Claims

In the ceiling inspection opening which comprises an inner frame provided with a hinge shaft portion and an outer frame provided with a bearing body for fitting the hinge shaft portion, and the inner frame is rotatably arranged with respect to the outer frame.
The bearing body is a flat plate whose bottom surface is attached to the inner flange surface of the outer frame, and is provided at an in-plane lower portion of the flat plate. The front end surface is flush with the inner flange surface, and bulges toward the rear end portion. Continuing to the curved guide groove bottom, the rear end of the guide groove bottom, the fitting part positioned below the curved top of the guide groove bottom, and the upper wall opened at a predetermined interval from the guide groove bottom And a stopper portion provided on a protruding portion that protrudes forward from the opening front end of the guide groove bottom portion and that prevents the hinge shaft portion from moving upward.

The stopper portion is set to a bulging curved surface whose bottom surface is curved in a bulging shape toward the fitting portion, and the opening front end surface of the bottom of the guide groove is moved backward further from the rear end of the bottom bulging curved surface. The bearing body for a ceiling inspection port according to claim 1, wherein